Microstructure and mechanical properties of Cu-3 at.% Ti alloy aged in a hydrogen atmosphere

Satoshi Semboshi, Tomoya Nishida, Hiroshi Numakura

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59 Citations (Scopus)


The microstructure of Cu-3 at.% Ti alloy aged at 773 K in a hydrogen atmosphere of 0.37 MPa has been investigated, together with hardness and tensile strength. At the early stage of aging, needle-shaped α-Cu4Ti particles precipitate finely in a similar manner to the case of conventional vacuum-aging. On further aging, some α-Cu4Ti precipitates are extended, while others are replaced by δ-TiH2 precipitates. The precipitation of titanium hydride reduces the concentration of Ti in the matrix more efficiently than aging in a vacuum. The yield strength first rises, but falls on further aging. This is due to the microstructural evolution: α-Cu4Ti particles first form and grow, but then diminish because of the formation of titanium hydrides. Elongation to fracture, as well as the electrical conductivity, is promoted by long-time aging in the hydrogen atmosphere, reflecting the reduced Ti concentration in the matrix.

Original languageEnglish
Pages (from-to)105-113
Number of pages9
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Issue number1-2
Publication statusPublished - 2009 Aug 20


  • Age-hardening
  • Aging
  • Cu-Ti alloy
  • Hydrogen
  • Mechanical properties
  • Precipitation


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